A combination of plasma membrane sterol biosynthesis and autophagy is required for shade-induced hypocotyl elongation.

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State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_FC24C76DB11B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A combination of plasma membrane sterol biosynthesis and autophagy is required for shade-induced hypocotyl elongation.
Journal
Nature communications
Author(s)
Ince Y.Ç., Krahmer J., Fiorucci A.S., Trevisan M., Galvão V.C., Wigger L., Pradervand S., Fouillen L., Van Delft P., Genva M., Mongrand S., Gallart-Ayala H., Ivanisevic J., Fankhauser C.
ISSN
2041-1723 (Electronic)
ISSN-L
2041-1723
Publication state
Published
Issued date
10/10/2022
Peer-reviewed
Oui
Volume
13
Number
1
Pages
5659
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
Plant growth ultimately depends on fixed carbon, thus the available light for photosynthesis. Due to canopy light absorption properties, vegetative shade combines low blue (LB) light and a low red to far-red ratio (LRFR). In shade-avoiding plants, these two conditions independently trigger growth adaptations to enhance light access. However, how these conditions, differing in light quality and quantity, similarly promote hypocotyl growth remains unknown. Using RNA sequencing we show that these two features of shade trigger different transcriptional reprogramming. LB induces starvation responses, suggesting a switch to a catabolic state. Accordingly, LB promotes autophagy. In contrast, LRFR induced anabolism including expression of sterol biosynthesis genes in hypocotyls in a manner dependent on PHYTOCHROME-INTERACTING FACTORs (PIFs). Genetic analyses show that the combination of sterol biosynthesis and autophagy is essential for hypocotyl growth promotion in vegetative shade. We propose that vegetative shade enhances hypocotyl growth by combining autophagy-mediated recycling and promotion of specific lipid biosynthetic processes.
Keywords
Arabidopsis/metabolism, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Autophagy/genetics, Carbon/metabolism, Cell Membrane/metabolism, Gene Expression Regulation, Plant, Hypocotyl/genetics, Light, Lipids, Phytochrome/metabolism, Sterols/metabolism
Pubmed
Web of science
Open Access
Yes
Create date
17/10/2022 13:36
Last modification date
14/02/2023 7:16
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